Revolving screen.



'PATENTED OUT. 10, 1905.

W. UROSSLEY. REVOLVING SCREEN.

APPLICATION FILED JAN. 12, 1905.

2 SHEETS-SHEET 1.

INVENTOH ATTORNEY Ji e No. 801,442. PATENTED 0017 .10, 1905. W. OROSSLBY. REVOLVING SCREEN.

APPLICATION FILED JAN.12, 1905 2 SHEBTSSHEET 2.

Fly, 5'

UNITED STATES PATENT orrron.

. Specification of Letters Patent.

Patented Oct. 10. 1905.

Application filed January 12, 1905. Serial No. 240,742.

or similar material and separating or sorting Y 1t lnto various grades or sizes.

Such an implement is termed a "grizzly in connection with running use, and it ordinarily comprises a cylindrical. shell perforated with circular apertures, which are extremely subject to clogging, especially when the material passed through the screen is of a clayey nature, as is commonly the case.

My invention has for its object to provide a grizzly which is adapted for self-cleaning and not subject to become clogged and which also may be readily constructed or set up and easily repaired.

The improvement consists in a novel sectional cylindrical grating or arrangement of parallel bars and in the novel segmental construction and combination of parts and in the method of operating the grizzly, all as hereinafter more particularly described and claimed.

In the accompanying drawings, forming a part of this specification, Figure 1 is a side elevation of my improved sectional grizzly shown as set up for operation. Fig. 2- is a cross-section on the line 00 as, Fig. 1. Fig. 3 is a cross-section similar to Fig. 2 of one of the sections of the grizzly and showing a part of the next adjacent sections in end elevation. Fig. 4 is a side elevation of the sections shown in Fig. 3 viewed from the interior of the drum. Fig. 5 is a side elevation similar to Fig. 4 of an end segment and drum. Fig. 6 is a radial section through Fig. 5.

Referring to the drawings, A designates the gizzly, which is of cylindrical or drum shape and is divided longitudinally at the cross-planes a, into three sections of various grades of grating all bolted together to form a single continuous cylinder. Each section comprises a number of segmental elements B, each composed of a series of longitudinal parallel bars or girders d, cast or otherwise joined together at the ends by a flange e to form a sort of grating. Said flange extends inwardly from the grating or bars d to form a next adjacent segments of the adjoiningsection or division, as shown in Figs. 3 and 4, and is bolted thereto by the bolts j, passed through the flanges 6. This method of securing the elemental segments and sections of the grizzly unites the parts in a continuous cylinder or drum of great strength and which may be readily assembled or taken apart for removal or repair. the cylinder the segmental elements of the two end sections or divisions are bolted to a grooved Wheel rim or ring g, which may be composed of segments h, bolted to the segmental gratings B in the same manner as the gratings are bolted together.

The method of operating the grizzly consists in suspending it by a pair of steel-wire belts i, fitting in the grooved rings g, from suitable grooved pulleys L on a shaft m, which is rotated by suitable power, and thus revolves the screen by means of its suspensionbelts i. The screen is hung at a slight inclina tion from the horizontal, and the material to be sifted being thrown in at the upper end of At the ends of the cylinder is gradually carried down the incline and sifted and sorted on its way and discharged through the spaces between the bars of the gratings and at the lower end of the grizzly. These spaces progressively vary in width in each of the sections or divisions of the cylinder, the coarsest being those of the division at the highest end of the grizzly and the finest those of the division at the lowest end thereof. Any number of divisions and any size of space between the grates and width of the segmental elements may be employed, as required.

The grates or bars of the segments B are broadest at the edge toward the interim of the cylinder and thinnest at their outer edges, whereby any substance that once enters be tween them will fall through without clogging. This construction renders this grating to a great extent self-cleaning. The method of suspending the grizzly by belts is very advantageous in regard to accessibility to the interior of the shell-cylinder, both for depositing the material to be screened and entering the shell, as the ends are entirely open and not obstructed by a shaft and its supporting-arms. In the case of one of the grate-bars becoming worn or broken it can easily be removed and replaced by a new section.

I claim as my invention and desire to secure by Letters Patent-- 1. A revolving screen or grizzly comprising in combination a series of segmental sec tions each composed of a series of longitudinal grates joined at their ends, the sections being secured together to form a complete cylinder or drum, substantially in the man ner and for the purpose specified.

2. A revolving screen or grizzly comprising in combination a series of segmental sections provided with apertures or spaces and bolted at their ends to overlapping segmental parts to form a complete cylinder or drum, substantially as and for the purpose specified.

3. A revolving screen or grizzly comprising in combination a series of segmental sections composed of longitudinal grates with intervening spaces, and a series of segmental parts overlapping upon the ends of the segmental sections and bolted thereto, substantially as and for the purpose specified.

4. A revolving screen or grizzly comprising in combination a series of cylindrical sections or divisions each comprising a series of segmental elements, perforated or provided with apertures, each segmental element being overlapped at its ends upon the two next ad jacent segments of the next adjoining cylindrical section and bolted thereto to form a continuous and complete cylinder or drum, substantially as and for the purpose specified.

5. A revolving screen or grizzly comprising in combination a series of cylindrical sections or divisions each comprising a series of segmental elements composed of longitudinal grates, each segmental element being overlapped at its ends upon the two next adjacent segments of the next adjoining cylindrical section and bolted thereto to form a continuous and complete cylinder or drum, substantially as and for the purpose specified.

Signed by me at New Haven, Connecticut, this 3d day of January, 1905.

WILLIAM CROSSLEY. 

